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Pronunciation varies by accent · noun
(biochemistry) hydrogen produced (along with oxygen) by the photolytic decomposition of water in certain anaerobic algae etc.
Use photohydrogen when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Photohydrogen means (biochemistry) hydrogen produced (along with oxygen) by the photolytic decomposition of water in certain anaerobic algae etc.
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use photohydrogen where its definition matches the intended context.
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